Parametric Study and Optimization of WEDM Parameters for Titanium diboride TiB2
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1 Parametric Study and Optimization of WEDM Parameters for Titanium diboride TiB2 Pravin R. Kubade 1, Sunil S. Jamadade 2, Rahul C. Bhedasgaonkar 3, Rabiya Attar 4, Naval Solapure 5, Ulka Vanarase 6, Sayali Patil 7 1 Assistant Professor, Dept. of Production Engg., KIT s COE Kolhapur, Maharashtra, India 2,4 Assistant Professor, Dept. of Mechanical Engg., KIT s COE Kolhapur, Maharashtra, India 4-7 U.G. Scholars, Dept. of Production Engg., KIT s COE Kolhapur, Maharashtra, India *** Abstract - Wire electrical discharge machining (WEDM) is used in industry for machining complex profiles with high accuracy in conductive material. In the present work, the parametric optimization method using Taguchi method is proposed for WEDM of Titanium diboride TiB2 component. Three process parameters are selected for this investigation; Pulse ontime, Pulse off-time and wire feed. The experimentation is conducted by using Taguchi s L27 orthogonal array. Signal to Noise ratios of the Material removal rate, Surface roughness and Overcut for all experiments are calculated. The results are analyzed using analysis of variance (ANOVA) and response graphs and presented. Keywords: WEDM, Pulse on-time, Pulse off-time, TiB 2. Key Words: TiB 2, etc 1. INTRODUCTION WEDM, Pulse on-time, Pulse off-time, amount of clamping pressure required to hold small, thin and fragile parts is minimal, preventing damage or distortion to the work-piece. The accuracy, surface finish and time required to complete a job is extremely predictable, making it much easier to quote; WEDM leaves a totally random pattern on the surface as compared to tooling marks left by milling cutters and grinding wheels. The WEDM process leaves no residual burrs on the workpiece, which reduces or eliminates the need for subsequent finishing operations. From the literature several researchers have been applied the Taguchi method to optimize the process parameters in WEDM process. In the Present work Titanium diboride TiB 2 is considered for measuring the output parameters like material removal rate, surface roughness and overcut using Taguchi method. Electrical Discharge Machining (EDM) was first introduced in the 1940's as a crude device used to cut broken machining tools from expensive in-process parts. Since that time EDM has become a sophisticated and indispensable technology, revolutionizing the tool, die, and mold making industries, and making significant inroads into the production of highly accurate, intricate and difficult to machine production parts. In electrical discharge machining, it is important to select machining parameters for achieving optimal machining performance. Usually, the desired machining parameters are determined based on experience or handbook values. However, this does not ensure that the selected machining parameters result in optimal or near optimal machining performance for that particular electrical discharge machine and environment. The wire does not touch the work-piece, so there is no physical pressure imparted on the work- piece compared to grinding wheels and milling cutters. The Fig -1: Schematic Representation of WEDM 2. EXPERIMENTAL DESIGN Proper experimental design significantly contributes towards the accurate characterization and optimization of the process, in present work Taguchi L 27 orthogonal experiments is used to study the influence of process parameters on MRR, OC and SR. In this study process parameters selected are Pulse-on Time (TON), Pulse-off time (T OFF) and Wire feed rate (WF) whereas the Performance measures are: Material removal rate (MRR), Surface roughness (SR) and Overcut (OC).The work-piece selected for investigation of optimum setting for WEDM process is TiB 2. The chemical composition of TiB 2 is as shown in Table 1. Page 1657
2 Table -1: Chemical composition (in %) Ti B N Si Fe Ni Controlled process parameters such as Pulse on time (T ON), Pulse-off-time (T OFF) and Wire Feed (WF) used in this study are shown in Table 2. Each factor is investigated at different levels to determine the optimum settings for the WEDM process. These parameters and their levels were chosen based on the review of literature and the few preliminary investigations. The other process parameters may have effect on measure of performance. To avoid these, the other process parameters are kept constant; Servo voltage 50V, Servo feed 2100, Peak current 230A, Peak voltage 2, Water pressure 0lpm, Wire tension 8gm. The smallest standard 3-level Orthogonal Array L 27 is chosen. Table -2: Control factors and their levels Control factors Unit Level 1 Level 2 Level 3 Pulse-on time µs Pulse-off time µs Wire feed rate mm/min The parameters that were studied to determine the optimum setting for the WEDM process are as shown in Table 2. Table No. 3 shows the twenty seven cutting experimental runs with the assigned levels of the process parameters according to the selected L 27 orthogonal array. Table -3: S/N ratios of MRR, SR and OC Expt. S/N ratios for S/N ratios S/N ratios for No. MRR (gm/min) for SR (µm) OC (mm) Table -4: Response table for S/N ratio for MRR (Higher Level T ON T OFF W F Delta Fig -2: Main effect Plot of S/N ratios for Material Removal Rate Page 1658
3 In main effect plot of S/N ratio for material removal rate, x-axis indicates different levels of process parameters and Y-Axis shows average of S/N ratio. It can be observed from Graph no.1 that material removal rate increase with increase in pulse-on time and pulse of time. Wire feed rate have very small effect on material removal rate. Table No. 5: Response table for S/N ratio for SR (Lower Level T ON T OFF W F Delta Rank Fig -4: Main effect Plot of S/N ratios for overcut In main effect plot of S/N ratio for overcut, X axis indicates different levels of process parameters and Y axis shows average of S/N ratio. It can be observed from given Graph no.3 that overcut increases with increase in pulse-off time and also increases with increasing in pulse-on time and wire fed rate has very small effect on overcut. Table No. 7: Conformation of experiments for MRR Fig -3: Main effect Plot of S/N ratios for surface roughness In main effect plot S/N ratio for surface roughness, X-axes indicate different levels of process parameters and Y-axis shows average of S/N ratio. It can be observed from Graph no.2 that surface roughness decreases with decrease in pulse-on time. Pulse-off time and wire feed rate have very small effect on surface roughness. Table No. 6: Response table for S/N ratio for OC (Lower Level TON TOFF WF Delta Rank Level A3-B3-C3 S/N ratio MRR Table No. 8: Conformation of experiments for SR Level A1-B1-C2 S/N ratio SR Table No. 9: Conformation of experiments for OC Level A3-B3-C3 S/N ratio OC Comparison between actual experimented values and RSM prediction values. Result obtained from RSM method and experimented method should be validated. Results obtained from both experimented values and RSM prediction values are cross checked with each other. Finally residual error between then is found out. Page 1659
4 Table No. 10: Comparison between actual and RSM values for MRR, OC Performance Residual Actual Predicted Measures Error % Error MRR SR OC CONCLUSIONS The effect of pulse-on time, pulse-off time and wire feed are investigated in machining of TiB2 by keeping other process parameters constant. Use of the Taguchi method for the optimization of the wire-cut electric discharge machining process is demonstrated in this work. Based on the experimental results, the conclusions can be drawn as follows. 1. The Pulse-on time and pulse-off time are most significant whereas wire feed rate is insignificant for material removal rate. Response table for MRR indicate that pulse-on time has most effect on MRR followed by pulse-on time and wire feed rate. For maximum MRR, the recommended parametric combination is A3-B3-C3. 2. Response table for SR indicate that pulse-off time has most significant effect on SR follow by pulse-on time and wire feed rate. For better surface finish, the recommended parametric combination is A1-B1-C2. 3. Response table for OC indicate that pulse-off time has most effect on SR followed by pulse-on time and wire feed rate. For minimum OC, the recommended parametric combination is A3-B3-C3. The approach used in this study can be used for other material like steel and aluminium. The effect of thickness of material on output can be studied by using work piece material of different thickness. REFERENCES [1] Muthu Kumar. Suresh Babu, Venkatasamy and Raajenthiren, Optimization of the WEDM Parameters on Machining Incoloy -800 Super alloy with Multiple Quality Characteristics, International Journal of Engineering Science and Technology, Vol. 2(6), (2010) [2] Rina Chakravorty, Susanta Kumar Gauri, Shankar Chakraborty, A modified principal component analysis-based utility theory approach for optimization of correlated responses of EDM process, International Journal of Engineering, Science and Technology, Vol. 4, No. 2, (2012), pp [3] S. Sarkar, Mitra S, Bhattacharyya B Parametric optimization of wire electrical discharge machining of γ titanium aluminide alloy through an artificial neural network model, Int. Journal of Adv. Manufacturing Technolgy (2006) 27: [4] Saurav Datta, Siba Sankar Mahapatra, Modeling, simulation and parametric optimization of wire EDM process using response surface methodology coupled with grey-taguchi technique, International Journal of Engineering, Science and Technology, Vol. 2, No. 5, (2010), [5] Sorabh, Manoj Kumar, Ne raj Nirmal A Literature Review on Optimization of Machining Parameters in Wire EDM, International Journal of Latest Research in Science and Technology, Vol. 2, Issue 1, (2013), [6] Parveen Kumar, Bharat Bhushan & Dr. R.K. Gupta., A Literature Review on Optimization of Input Machining Parameters of Wire-EDM, International Journal of Research in Management, Economics and Commerce, Volume3, Issue 9, (2013), [7] Lokesh Goyat, Rajesh Dudi, Neeraj Sharma, WEDM Development and Optimization of Process: A Review, International Journal of Innovations in Engineering and Technology (IJIET), Vol. 2 Issue 3, (2013), [8] S. Mahendran, R. Devarajan, T. Nagarajan, and A. Majdi, Micro-EDM: Overview and Recent Developments, National Conference in Mechanical Engineering Research and Postgraduate Students, (2010), [9] G. M. Pradeep, Experimental Investigation and Analysis of Air with Water Mist Wire Cut Electrical Discharge Machining Process Using Rsm, Methodology, International Journal of Innovative Research in Science, Engineering and Technology Volume3, Special Issue 4, (2014), [10] Pujari Shinivasa Rao et al., Effect of WEDM conditions on surface roughness: A parametric Optimization using Taguchi method, IJAEST Vol. 6, Issue-1, (2011) [11] Pujari shrinivas Rao, Dr. Koona Ramji and Prof. Beela Satynarayana, Prediction of Material removal rate for Aluminum BIS Alloy in wire-cut EDM, IJEST Vol. 2 (12), (2010) [12] Shandilya et al. Optimization of SiCp/6061 Al(MMC) by WEDM process using surface methodology (2012) [13] S. Dhanabalan et al., Optimization of the electrical discharge machining process parameters with Multiple Performance Characteristics based for Titanium Grades, European Journal of Scientific Research, Vol. 68, (2012), [14] Atul Kumar and Dr. D. K. Singh, Strategic Optimization and Investigation Effect process parameters on Performance of WEDM, IJEST, Vol. 4, 2012, [15] S. B. Prajapati and N. S Patel Optimization of the process parameters on performance measures of wire EDM for AISI A2 tool steel,ijcer Vol. 3, Issue-4 (2013) [16] Ansish Kumar, Vinod Kumar, Jatinder Kumar, Experimental investigation on material transfer Page 1660
5 mechanism in WDEM process of pure titanium(grade2), Advances in Material Science and Engineering, Vol.-2013(2013), Article ID , 20 pages. [17] Kamal Jangra, Ajai Jain and Sandeep Grover, Optimization of performance characteristics in WEDM process using Taguchi method and gray relational analysis, Journal of Scientific & Industrial Research, Vol.-69, Aug. 2010, pp [18] S. Sivanaga et al., Parametric Evaluation for Machining Die-Steel with WEDM, International Journal of Scientific and Research Publications, Volume 3, Issue 4, April 2013 ISSN (2013). Page 1661
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